I second the capacitors as with this age it's time.

> Subject: Re: Sick mac 840AV
> From: [email protected]
> Date: Fri, 29 Jun 2012 07:08:31 -0700
> To: [email protected]
> 
> 
> On Jun 27, 2012, at 8:11 AM, Arthur Rosen wrote:
> 
> > I have a Mac 840AV that recently has had two problems.
> > First, the audio quit.  I checked the speaker and its connection and all is 
> > well there.
> > Second (several months after above problem), when is booted, it does 
> > nothing (black screen) for 10-15 minutes than boots.  After it is on for a 
> > while I can shut it down and reboot and it comes up promptly. Replaced the 
> > EPROM battery and zaped the EPROM without any change. Any suggestions?
> 
> Have you checked the capacitors? Your symptoms all sound like classic signs 
> of failed, leaking capacitors on the logic board.
> 
> - Dylan
> 
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